provider: Fix bug with GCE desynchronized booting and stopping
provider: Fix bug with GCE desynchronized booting and stopping

secant/quilt,NetSys/quilt,PenguinToast/quilt,ZhongtianWang/quilt,NetSys/quilt,quilt/quilt,PenguinToast/quilt,kelda/kelda,kayousterhout/quilt,stevenlin598/quilt,kayousterhout/quilt,stevenlin598/quilt,LuiseV/quilt,ejj/quilt-dev,kklin/quilt,LuiseV/quilt,tejasmanohar/quilt,akshayknarayan/quilt,kklin/kelda,stevenlin598/quilt,stevenlin598/quilt,tejasmanohar/quilt,PenguinToast/quilt,NetSys/quilt,secant/quilt,ejj/quilt-dev,quilt/quilt,LuiseV/quilt,stevenlin598/quilt,NetSys/quilt,kklin/quilt,kelda/kelda,akshayknarayan/quilt,secant/quilt,kayousterhout/quilt,kklin/kelda,ZhongtianWang/quilt,kelda/kelda,kelda/kelda,tejasmanohar/quilt,ejj/quilt-dev,quilt/quilt,akshayknarayan/quilt,mmussomele/quilt,kklin/quilt,ZhongtianWang/quilt,ejj/quilt-dev,LuiseV/quilt,NetSys/quilt,kklin/kelda,secant/quilt,tejasmanohar/quilt,akshayknarayan/quilt,mmussomele/quilt,LuiseV/quilt,mmussomele/quilt,kklin/quilt,quilt/quilt,mmussomele/quilt,PenguinToast/quilt,stevenlin598/quilt,mmussomele/quilt,secant/quilt,ZhongtianWang/quilt,kayousterhout/quilt,mmussomele/quilt,PenguinToast/quilt,kklin/kelda